INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
•
The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
•
The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
•
The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT21
Dual 4-input AND gate
Product specification
File under Integrated Circuits, IC06
December 1990
Philips Semiconductors
Product specification
Dual 4-input AND gate
FEATURES
•
Output capability: standard
•
I
CC
category: SSI
GENERAL DESCRIPTION
74HC/HCT21
The 74HC/HCT21 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT21 provide the 4-input AND function.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°C;
t
r
= t
f
= 6 ns
TYPICAL
SYMBOL
t
PHL
/ t
PLH
C
I
C
PD
Notes
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
µW):
P
D
= C
PD
×
V
CC2
×
f
i
+
∑
(C
L
×
V
CC2
×
f
O
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs
2. For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
−
1.5 V
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”.
PARAMETER
propagation delay nA, nB, nC, nD to nY
input capacitance
power dissipation capacitance per package
notes 1 and 2
CONDITIONS
HC
C
L
= 15 pF; V
CC
= 5 V 10
3.5
15
HCT
12
3.5
16
ns
pF
pF
UNIT
December 1990
2
Philips Semiconductors
Product specification
Dual 4-input AND gate
74HC/HCT21
Fig.4 Functional diagram.
Fig.5 Logic diagram (one gate).
FUNCTION TABLE
INPUTS
nA
L
X
X
X
H
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
nB
X
L
X
X
H
nC
X
X
L
X
H
nD
X
X
X
L
H
OUTPUT
nY
L
L
L
L
H
December 1990
4
Philips Semiconductors
Product specification
Dual 4-input AND gate
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
I
CC
category: SSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
T
amb
(°C)
74HC
SYMBOL PARAMETER
+25
min. typ.
t
PHL
/ t
PLH
propagation delay
nA, nB, nC, nD to nY
33
12
10
t
THL
/ t
TLH
output transition time
19
7
6
max.
110
22
19
75
15
13
−40
to+85
min. max.
140
28
24
95
19
16
−40
to+125
min. max.
165
33
28
110
22
19
ns
ns
UNIT
74HC/HCT21
TEST CONDITIONS
V
CC
(V)
2.0
4.5
6.0
2.0
4.5
6.0
Fig.6
WAVEFORMS
Fig.6
December 1990
5
嵌入式系统
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